Manual rigging using MA

Norm_Hall

Norm_Hall

New member
Location
Wauconda, (Chicago),IL,USA
Here is a vid of a tree limb we manually rigged using a 5 to 1 MA system. The limb had broken off and was resting on the clients home. We set up the 'side swing control lines' before removing the brush from the top. After taking as much weight off as possible, we set up a moving pulley at the top to get as much MA as possible. The MA started around 1.4X and as we pulled, the MA got less. Since we had no GRCS with us, we set up a 5 to 1 system which 1 guy was able to pull the spar off the roof using a handled ascender for better grip.
Sorry about the sound quality, it was very windy that day.

http://www.youtube.com/watch?v=i3pkgoKT3-A

2min. 9 seconds
 
Nice work.
Question: could you have tied off a seperate rope around the base of the tree, below the porta wrap and mounted a handled comealong to it? You could then attach the hook to a rope grab (friction hitch, assender) and use the comealong, and tend the slack through the porta wrap. When all the cable is in from the comealong, tie off like you did in the porta wrap, and advance the rope grab and comealong cable up the rope and start over. I think it would work if you needed more pulling force, and you would still have the porta for safety and backup. Of course you would have to match the rope grab capacity to the forces envolved.
 
I've hooked a comealong onto a 3:1 setup, I used a prusik and a carabiner hooked onto the comealong (backed-up with a portawrap) I've used it to pull trees over, I haven't used it how Norm did, but I would imagine it would work fine.

WP
 
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Nice work.
Question: could you have tied off a seperate rope around the base of the tree, below the porta wrap and mounted a handled comealong to it? You could then attach the hook to a rope grab (friction hitch, assender) and use the comealong, and tend the slack through the porta wrap. When all the cable is in from the comealong, tie off like you did in the porta wrap, and advance the rope grab and comealong cable up the rope and start over. I think it would work if you needed more pulling force, and you would still have the porta for safety and backup. Of course you would have to match the rope grab capacity to the forces envolved.

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Sure! But, we didn't need it. We set up a 5 to 1 system and 1 guy was able to pull up the limb.
You can just attach 1 end of the comealong to the retension bar on the porty. No need for a 2nd sling.
 
And this is why Uncle Norm is the man. He sees a situation and makes due with what he's got and handles it so well.
Plus I love the new avatar.
 
Cute little guy, isn't he. He was in a hollow, in a tree we felled. Mama ran away and left 2 youngins. One wasn't so friendly, but this guy didn't seem to mind. We put him in a hollow log about 100 yards from the tree overnite. Next day, he was gone.
 
so how did you get the brush off the top and tie that pulley to the piece resting on the house? did you climb that mulberry or was there a bucket access somewhere? and also, how did you finish putting that busted limb on the ground?

that looked like a great learning opportunity, thanks for sharing.
 
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1. so how did you get the brush off the top and tie that pulley to the piece resting on the house? did you climb that mulberry or was there a bucket access somewhere? and also, 2. how did you finish putting that busted limb on the ground?

3. that looked like a great learning opportunity, thanks for sharing.

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1. We got permission to use the nabors drive for bucket access. Most of the brush was bucket accessible. Some we rigged from the bucket with a polesaw. The pulley was installed by the bucket operator, PJ. The tie off to the right (for the pulley), went through a branch union and was tied off near the base of the tree (mulberry).

2. We cut sections off the bottom of the spar and kept lowering it til we could handle it.

3. Penguin, you wooda loved it.
 
i as wondering that too MB.

Is the Stainless Steel pulley with spread legs of support at the top part of the lift off? Is that the reducing MA as the angle spread? Then 5:1 applied to that?

Back up anti-slip prussik on lift?

We've also used a 1 ton truck with weight in the back; into a 3:1; with a 2 prussiks/ back up grab to lift a very large tree off from another tree over a house, to boldly go where no crane would go (soft ground where crane would sit and wires too). Also 3:1'd a tree; into a 5:1 that i hung on and 2handed(before i had named it); while 3 guys on ground pulled on the rig too. It was tough, but we did it. The 2handed 5:1 should have delivered 8x effort + 5x my body weight + 5x the other guys' pull(2 Spanish guys that about all they understood was 'pull the crazy white boy down' as i shouted it).
1 Shot over wall

Friggin'Riggin' your way is great!
 
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